Ethan

3. , the smallest unit of an element that maintains the properties of that element
4. , a sample of matter either a single element or a single compound that has definite chemical and physical properties
7. , the amount of force exerted per unit area of a surface
8. a chart that organizes all known chemical elements by increasing atomic number arranging them in rows and columns so elements with similar chemical properties appear in the same group demonstrating the periodic law of recurring characteristics
11. , a substance that cannot be separated or broken down into simpler substances by chemical means
13. , a measure of how hot or cold something is
15. , a measure of the amount of matter in an object
17. , the change of a substance from one physical state to another
18. ,a substance made up of atoms of two or more different elements joined by chemical bonds

1. , the total kinetic energy of a substance's particles
2. , the state of matter that has a definite volume but not a definite shape
5. ,a sample of matter either a single element or a single compound that has definite chemical and physical properties
6. ,a group of atoms that are held together by chemical forces a molecule is the smallest unit of a compound that keeps all the properties of that compound
9. , the amount of space that an object takes up or occupies
10. , anything that has mass and takes up space
12. , a form of matter that does not have a definite volume or shape
14. , mass divided by volume
16. , the state of matter in which the volume and shape of a substance are fixed